ABB VUBB User Manual

Also see for VUBB: Installation and commissioning guide User guide

ABB VUBB User Manual Manual pdf 4 page image

4. Operation ......................................................................................................................... 294.1 Synchronization between tap-changer and motor-drive mechanism .......................... 295. Inspection......................................................................................................................... 305.1 General ..................................................................................................................... 305.2 Inspection ................................................................................................................. 305.3 Checking oil quality ................................................................................................... 315.4 Maintenance ............................................................................................................. 315.5 Replacement of the complete switching mechanism including vacuum interrupters .. 316. Troubleshooting ................................................................................................................ 327. Repairs and adjustments .................................................................................................. 337.1 General ..................................................................................................................... 338.1.1 Serial number ..................................................................................................... 337.2 Oil leakage ................................................................................................................ 337.2.1 General .............................................................................................................. 337.2.2 Tools required ..................................................................................................... 337.2.3 Materials and spare parts required ...................................................................... 337.2.4 Procedure .......................................................................................................... 337.3 Replacement of pressure relay .................................................................................. 358. Electrical diagrams ........................................................................................................... 368.1 Standard circuit diagram BUE ................................................................................... 378.2 Contact timing diagram BUE..................................................................................... 388.3 Standard circuit diagram BUL2 ................................................................................. 398.4 Contact timing diagram BUL2 ................................................................................... 409. Technical data .................................................................................................................. 419.1 Dimensions ............................................................................................................... 419.2 Weights .................................................................................................................... 419.3 Specification of materials .......................................................................................... 419.3.1 General .............................................................................................................. 419.3.2 Tap-changer housing .......................................................................................... 419.3.3 Selector switch ................................................................................................... 419.3.4 Gearing mechanism ........................................................................................... 429.3.5 Drive shaft system .............................................................................................. 42